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arXiv 1109.2109hep-ph
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横向动量再确认:Tevatron和LHC的希格斯玻色子生产

Transverse-momentum resummation: Higgs boson production at the Tevatron and the LHC

D. de Florian, G. Ferrera, M. Grazzini, D. Tommasini

摘要:

本文研究了强子碰撞中胶子融合产生的标准模型希格斯玻色子的横动量分布。在小q_T(q_T <<m_H,m_H为希格斯玻色子的质量)条件下,我们重新计算了QCD微扰理论中所有阶次的多重软胶子辐射对量子力学增强的贡献。在q_T(q_T <~mH)的中、大值时,我们一致地将重算与已知的固定阶结果结合起来。我们使用目前最先进的微扰信息:下一个到下一个到领先的对数重算结合下一个到领先的固定阶计算。我们在计算中将以前的结果精确地推广到所有的微扰项,直到达到q阶^[4],并且在q_T上积分后,我们恢复了已知的总截面的次-次-首阶结果。我们目前在Tevatron和LHC的数值结果,以及相应的不确定性的估计。我们的计算是在一个更新版本的数字代码HqT。

英文摘要:

We consider the transverse-momentum (q_T) distribution of Standard Model Higgs bosons produced by gluon fusion in hadron collisions. At small q_T (q_T<<m_H, m_H being the mass of the Higgs boson), we resum the logarithmically-enhanced contributions due to multiple soft-gluon emission to all order in QCD perturbation theory. At intermediate and large values of q_T (q_T <~m_H), we consistently combine resummation with the known fixed-order results. We use the most advanced perturbative information that is available at present: next-to-next-to-leading logarithmic resummation combined with the next-to-leading fixed-order calculation. We extend previous results including exactly all the perturbative terms up to order alphas^4 in our computation and, after integration over q_T, we recover the known next-to-next-to-leading order result for the total cross section. We present numerical results at the Tevatron and the LHC, together with an estimate of the corresponding uncertainties. Our calculation is implemented in an updated version of the numerical code HqT.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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